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**Unformatted text preview: **reactions. 7. Why is magnesium hydroxide considered a weak base? 8. In lab Sally adds 0.0244 grams of solid calcium fluoride to 1.50 liters of pure water and stirs vigorously. For calcium fluoride K sp = 4.0 x 10-11 . Will the resulting solution be unsaturated, just saturated, or will solid be present? Show your work for full credit. 9. If you mix 225.0 mL of 0.015 M aqueous lead(II) nitrate with 125.0 mL of 0.045 M aluminum bromide, does a precipitate form? K sp for PbBr 2 = 6.9 x 10-6 . Must show your work mathematically by calculating no guessing. 10. Calculate the solubility of AuCl 3 (s) in pure water. K sp for AuCl 3 = 3.2 × 10-25 . 11. Calculate the molar solubility of AuCl 3 (s) in a solution containing 0.075 M CaCl 2 . Explain the difference between the solubility of AuCl 3 in question 10 and 11....

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